for of for in区别.html

<!DOCTYPE html>
<html>
<head>
	<title></title>
	<meta charset="utf-8"/>
</head>
<body>

</body>
<script type="text/javascript">

var nums = [1,2] 
let even = 0;
for (var i = 1; i < nums;i+=2) {
        console.log(i)
    }


Array.prototype.method=function () {
	console.log(this.length)
}
var myArray=[1,2,4,5,6,'a'];
myArray.name="数组";
var obj  = {a:3,d:4};
Object.prototype.fix = function () {
		console.log('fiex')
}
for(var i in obj){
    console.log(obj[i])
	if(obj.hasOwnProperty(i)){
	    console.log(obj[i])
	}
}
for(var i of myArray){
	console.log(i)
}

for (var index in myArray) {
  console.log(myArray[index]);
}

console.log(Object.keys(obj))

//object.keys不能获取对象原型上的属性
// for in遍历的是数组的索引（即键名）和原型上的方法，而for of遍历的是数组元素值。
// for in既可以遍历数组 又可以遍历对象
</script>
</html>